Möbius

Möbius water engineering (Moebius) - The company is, as far as I know,
located in Hamburg’s south eastern part. Its business is water engineering.
It is a white flag with a celestial blue tressure. A diamond of the same
colour containing a white capital “M” is in the centre. The diamond touches
the tressure at top and bottom.
Source: I spotted this flag on 23 July 2007 near Stade on the river
Elbe..
Klaus-Michael Schneider, 20 Apr 2009

Möbius variant

image by Klaus-Michael Schneider, 10 May 2009

Möbius variant - It is a plain white flag with the company logo in its
centre. The logo is a celestial blue diamond containing a white capitals
“M”. Its sharp points are touching the centre of a squarish tressure of
the same colour with rounded corners.
Source: based on a photo of a table flag, provided by Jan Mertens.
Klaus-Michael Schneider, 10 May 2009